/* Copyright (C) 2008  Romolo Camplani, Marco Fortunato, Marco Marelli, Guido Rota, Fabio A. Schreiber et al.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.dei.perla.parser.clauses;

import org.dei.perla.parser.util.Duration;

/**
 * E' utilizzata per specificare un refresh periodico (cioe' in corrispondenza di determinati istanti temporali) della causola EXECUTE IF e della clausola SAMPLING time-based
 */
public class RefreshTimeBased extends RefreshClause {
	
	/**
	 * Il periodo di tempo che intercorre tra due operazioni di refresh successive
	 */
	private Duration interval;
	
	
	/**
	 * Restituisce il periodo di tempo che intercorre tra due operazioni di refresh successive	
	 */
	public Duration getInterval() {
		return this.interval;
	}

	/**
	 * Imposta  il periodo di tempo che intercorre tra due operazioni di refresh successive
	 */
	public void setInterval(Duration interval) {
		this.interval = interval;
	}
	
	/**
	 * Restituisce lo spezzone di codice "perla" corrispondente
	 */
	public String toString() {
		String stringToReturn;
		
		stringToReturn = "REFRESH EVERY ";
		
		if(this.interval == null)
			stringToReturn += "<duration>";
		else
			stringToReturn += this.interval;
			
		return stringToReturn;
	}	
}
